Recuperator



,l 6? i l is, iena t erle/sagt@ "WILLEVI A. NORTON, 0F EPETTSBURG'H, PENNSYLVANXA, ASSEGEOR T0 THE AMSLER; MORTUN CDMEANY, Oli PITTSBURGH, EENNSYLVANIA, .la OR'ERATEQN @E @ENE-f SYLVANI.

REGUFERATR.

Application filed May 2l, 1926. Serial No. lld. @ne of the objects which ll have in kview is ments in the recuperator vnue structure 'the prevention ofthe burning out ofthe intewhereby the joint-s between the flue tile and rior structure of the recuperator adjacent 'to the flange tile or floor tile remain. sealed.

p the inlet of the waste furnace gases. @ther new and usefifl' improvements will c l accomplish this object by so controlling appear from the following description. en

and proportioning the amount of air admitln the accompanying drawings, wherein ll ted to the recuperator so that a greater voflhave illustrated the best embodiment of the urne of air passes through the portion of the principles of my invention now known to nie, rccuperator subjected to the highest teinlfig. l is a vertical longitudinal section of i peratures the recuperator; lfig. 2 is a vertical section e5 l may also form the air-fines against which taken along the irregular line ll-ll in lig.

the waste gases at their highest temperatures `l; ligs. 3, l and 5 are sectional views talren,

impact and which they surround of highly\ respectively, 'along the lines llllllllg refractory material while the other air iiues llt-ll/v, and lV-VY in lfig. l5 Fig. 6 is an' .a which aresubjected to lower temperatures enlarged detail partially in vertical section 70 o may be olf-material of higher conductivity, showing assembled liue-tile,`i'langetile and -such for instance as cast iron. floor-tile and also showing my improved l show novel means for accomplishing this sealed joint; Figs. 7 and 8 are details in perobjeot, spective showing inodied construction of ai Another object which l have in view is partition walls for the passages, and Fig., 9 75 the superlieating of the preheatedair during is a detail looking from the right in Fig. 2 its travel from the recuperator and also the showing the one of the air admission v*valvesI reduction of the temperatures of the waste .Referring to the drawings, the recuperator gases, after they leavethe furnace and bestructure hereinafter described, is inclosed zii fore they enter the recuperator, below the by the side walls 1, the rear wall 2, the front S0 refractory limit of the recuperator structure. wall 3 and the arched roof 4, the latter preff l accomplish this two-fold purpose by erably inclining upwardly and rearwardly as causing the waste gases, after they leave the shown in Fig: l. rfhe upper portion 0f the furnace and beforethey enter the reciiperafront wall is 'stepped forwardly as at 5 to i 3i tor, to travel in conductive proximity with' provide the inlet chamber 6 which is open S5 the preheated airI during the latters travel to the interior of the recuperator and also to J from the recuperator to the furnace the waste gases passage 7 whose top wall is By substituting this 'arrangement for the the arched roof a and whose door is formed present practice of direct delivery of the by the false arch 8' springing from the side preheated air fromthe recuperator to the walls l and parallel with the roof 4C. The e0 furnace and the, direct delivery of the waste front end of the false arch 8' merges into the gases from the furnace to the recuperator, ll arch 9 which separates the inlet and outlet amenabled to reduce the temperatures ofthe of the chamber 6 and spans the space bewaste gases'to below the refractory limit of tween the side walls l. rlihe arch 9 is sup-= 40 the recnperator without consequent thermal ported from below by the spaced apart piers e5 w loss; for the preheated air is superheated by l0 between which the waste gases enter the the heat of conduction from the waste gases. interior of the recuperator.

For this two-fold purpose lt provide anew l'lhe rear end of the passage 7 is closed by and improved system of air and waste gases the arch 1l which supports the front wall 45 passages between the furnace and the recuof the waste gases, and the preheated air teo perator., fluelater to he described.; Y Said passages are formed with relatively l2 represents a pair of angular passages thin common partition walls of refractory connecting with the rear end of the passage material separating the air and waste gases 7 at its sides, and also connecting to the 50. passages, and ll provide a new and improved lower ends of the two down-dues 13 which loa construction for such'walls which prevents have interposed between them the .up-due la.i leakageof air into the waste gases .passages the partitions being formed by relatively or the leakage ofthe waste' gases into the' thin walls of refractory material., which is air passages.. later to be more full describe-d, 55 l also provide newfand useful improve- The upper .ends o the down-'dues 13 are rio connected to the front ends of the horizontal] passages 15 communicating at their rear ends with the interior of the furnace 16, said passages l5 being separated by the horizontal which extends the ,gas burner 19. The upper end of the up-flue 14 communicates with the front end of the passage 17.

The lower end of the up-lue 14 is open to the interior of the recuperator in the rear ofthe arch 11.

The false arch 8 iscomposed of arcuate refractory tiles 20 whose bodies are relatively thin While their perimetral edges are thick ened, as shown in Fig. V1.v Thus the false arch, while substantial and self-supporting is adapted to the transference of heat by conduction.

The exit of waste gases is at the lower rear of the recuperator, the passage 21 leading to the chimney-flue,J Y

The interior recuperator structure is built up of the lloor tile 22, the flange tile 23 and the Hue tile 24.

The floor tile 22 and flange tile 23 shownI in the accompanying drawings are as described and claimed in Letters Patent No. 1,587,171 granted to me on June 1, 1926, while the lue tile 24 are identical with the 'due tile of said Letters Patent except for the ,improvement relative to the sealed joint, later to be described.

A horizontal closure formed of the floor Vtile 22 is supported in spaced relation with the bottom 25 of the recuperator and just below the escape passage 21, being carried on supports such as the .Tl-beams 26 and the partition wall 27. The wall 27 extends from side wall to side wall forming an air-tight partition which is nearer the front than the rear of the recuperator, and which forms two air admission chambers 28 and 29, the front chamber 28 being the smaller. The chambers 28 and 29 are supplied with air through ports 30 and 31, respectively, and each of said ports is provided with a hinged valve or gate 32 which is further provided with a circular hole having a pivoted dampe1" plate 33, so that the quantity of air introduced `into each of the chambers may be properly regulated. To prevent the burning out of the flue tile which are adjacent to the Waste gases admission from the chamber 6l arrange by means of the separate air control for the passage of a greater volume of air l.through such exposed tubes. The lue tile which'are not subjected to the higher temperatures may be formed of material having a higher conductivity, suchas cast iron, which material l may cially Where T preliminarily reduce the temperatures of the waste gases before they enter the Irecuperator by -superheating the preheated air.

ln assembling the interior structure of the 'recuperatorg the floor composed of the floor tile 22 is laid on the l-beams 26 and the par-v tition 27 and at the rear and frontresting .on the wall-ledges 2a and 3, and the edges of the tile fit together as shown. LThe llrst' series of llue tile 24 are then placed in position-with their lower ends stepped in the bores ofthe floor tile resting on the internal shoulders 22a of the door tile. A. series of flange tile 23l are then placed on top of the ue tile being supported by their internal shoulders 23a, the lateral projectrons 23b of ilue tile for the downward passage of waste f gases, said opening being at the front of the structure. A third `series of flue tilei are then placed in position and on their tops a series of flange tile. Then a yfourth series of flue tile and another series of flange tile. A4 l fifth series of due tile are placed on top of the last mentioned flange tile. @n top of the fifth series of fluetile ll lay a series composed of floor tile extending from the front of the recuperator, followed by flange tile adjacent tothe rear of the recuperator, thus forming a floor at the front and an opening at the rear for the downward passage of the waste gases. This Aseries of ,floor tile and `flange tile-is substantially level with the loor of the chamber 6. Asixth series of flue tile is then laid and a series of flange tile on lthe same. Another or seventh series of flue tile is erected on the last mentioned flange ltile and then another series of flange tile.

The eighth series of flue tile is then put in Vplace and a final series of floor tile laid thereon. I

Tt will be understood that the tile stack of the recuperator may be built up to any desired height, it being only important that the waste gases be ballled horizontally black andI forth in their travel within the walls enclosing the recuperaor structure from the inlet chamber 6 to the outlet 21substantially as'indicated by the arrows in Fig. 1.

The joints between the flue tileand the flange tile or floor tile are sealed with refractory material or clay, as shown at 34. lVhen the clay seal' becomes hardened by the heat, it tends to crack and drop from position`between the flue tiles and the superimposed ilange tile or floor tile, and to preventn this l reduce the ends of the llue tile to form "a circumferential shoulder 35 which` sup# lll nesaeio The partition walls `between tbe downilues 13 and the up-liue 14C, and between the passages 15 and the passage 17 should be gas and air tight to prevent the waste gases en'- tering the air flues and passages and vice versa. Thus in lFig. 2 l have shown the rows of partition walls formed of a plurality of refractory briclr 36, the rowsbeing on different levels so as to break the horizontal joints. lln lfig. 7 l show the partition built of superimposed tile 37 tongue and grooved on their faces and ends. ln lcl`ig. 8 l show the partition built of substantially Z-shaped' without consequent thermal loss by supertile 38.

llt will be noted that the recuperator is depressed below the furnace so that the dues 13 and 14C are vertical, which is 'the preferred arrangement.,v l A The waste furnace gases are drawn by the chimney draft from the furnace 16 through the passages 15g the dowh-lues 13, through the angular passages 12, the passages 7, into the rchamber 6 and Athence between the piers 10 into the recuperator interior wherein they are bellied back and forth during their downward passage to the escape 21. 'lhe air is admitted through the ports 30 and 31 into the chambers 28l and 29 and thence up through-the dues formed by the alined flue tile into kthe space above the recuperator structure below the false arch 8 and the lower end of the flue 1a..'f r:The upward and rearward inclined position of the false arch direct the preheated air, without loss of velocity, up the (flue 1d and into the combustion passage l17 wherein itis mingled with the fuel gas and from which it isdrawn into furnace 16. The relatively thinness of the tile 2O of the false arch 8 assists in the con duction of heat from the waste gases traveling above the arch 8 to the preheated air traveling in contact with the under side of the said arch.

lt will bed noted that the preheated air travels on its way from the recuperator to the furnace in proximity with the waste gases traveling in the opposite direction with relatively thin refractory walls intervening, so that there is a heat transference by conduction from the waste gases to the preheated air, edecting a, supcrheating of the latter and duction of the waste gases ,but with no consequent thermal loss.

A two-fold purpose is thus eected, ra reduction of the waste gases temperature to prevent burning out the recuperator struc,

ture anda superheating vofthe preheated air which eects improved combustion.

l By means of the air-control, provided by the separate bottom chambers 28 and 29 with their individual valves, ll 'am enabled to cause a greater volume of air to pass up through the air dues nearest the inlet of lthe waste gases from the chamber 6, thus y afconsequent temperature re-k preventing the burning out of the due tile wly lch are subjected to the highest temperatures while a less volume of air is caused to travel up thc flues farther from the inlet for waste gases and peratures. l am thereby enabled to prevent the burning out of the flues exposed to the higher temperatures and at the same time insure the proper preheating of the air passing through the more remote flues., i

By reducing the temperature of the waste gases, before they enterI the recuperator structure, which reduction l accomplish heating the preheated air, .l am enabled to vemploy as a material for the flue tile, at least those not directly exposed to the waste gases as they enter the rccuperatcr, which has greater vconductive properties, such, for instance, as cast iron.

'What l desire to claim is 1. 'ln combination with a. rccuperator comprising a plurality of air-passages and means for passing the `waste furnace gases between said passages, means for distributing the airpassing through said passages whereby a greater Avolume ofair is caused to'travel through the passages subjected to the higher temperature..

2, ln a recuperator the combination of a plurality of air-passages and means for passing the waste furnace passages, said air passages being grouped in relation to their nearness to the entrance of the waste furnace gases, and an individual air supply for each groupo 3. 'in a recuperator, the combination of a A vertically` disposed air-dues,

plurality of for introducing the waste furnace gases at one side of the plurality of lines and for the escape of said gases at the other side of said plurality of flues, and means for proportioningthe air supply for said airflues whereby a greater volume `may .be

caused to travel through the air-flues adjathus subject to lless temgases between said airlull.

cent to the entrance of the waste furnace gases.

el, a recuperator., the combination of a plurality of vertically disposed air-dues, meansI for introducing the waste furnace gases at one side ofothe plurality of flues and 'for the escape of said gases at the other side of said plurality of flues, said gases being caused travel baclr and forth. horizontally in the recuperator, and .means for proportioning the air supply for the air-lues whereby the air-dues subjected tothe hottest temperatures are supplied with an increased volume of air.

5.. ln a recuperator, the combination of a pluralityi of vertically disposed air-dues, means for introducing the furnace gases near the top and at one side of said plurality of flues andfor their escape at the other side lil) lues, and means for proportioning the airsupply to the dues whereby the lues subjected to the greatest temperatures are supplied with an increased volume of air.

6. ln a recuperator, the combination of al plurality of vertically disposed air-lines, means for introducing the furnace gases near the top and at one side of said 4plurality of f'lues and for their escape at the other side and .near the bottom of said plurality of fines, said gases being caused to travel back and forward horizontally between and around the flues through their passage through the recuperator, and means for proportioning the air-supply to the iues whereby the dues subjected lto the greatest temperatures are supplied with an increased volume of air.

7.' ln combination with a vertically'disposed flue tile and a horizontal tile having a recess into which the upper end ot the due tile is inserted, the joint. to be sealed with clay, of means for supporting the clay packing from below to prevent the same dropping from position at the joint.

8. ln combination with a vertically 'disposed flue tile and a horizontal tile having `a recess into which the upper end of the due tile is inserted, the joint to beXsealed with clay, of means on the Hue tile for supporting the clay packing fromibelow to prevent the same dropping from position at the joint.

9. ln combination -With a vertically disposed lue tile and a horizontal tile having a recess into which the upper end of the flue tile is inserted, the joint being packed with clay, of a circumferential shoulderF on the Hue tile to maintain the packing in position;

10. lin a recuperator structure, the com- 4o bination` with vertically disposed Hue tile in spaced relation to eachother, horizontallyp ywherein the air passes upwardly'and is heatL o ed by the waste furnace gases, of av partition of refractory material superimposed on the recuperator and in contact with the under side of which the preheated air travels to- Ward the furnace, and means for leading the waste furnace gases in contact With the upper side of the partition during their travel 4toward the recuperator interior.

l2. ln combination with a recuperator wherein the air passes upwardly and is heated by the waste furnace gases, of a par-` l tition spaced above the recuperator and in contact with the under side of which the preheated air passes from the recuperator, and means for leading the waste furnace gases Vin contact with the upper surface of the partition in their travel toward'the recuperator interior.

Signed' at Pittsburgh, Pa., this third day 70 of May, 1926.

`WILLAM A. MORTON. 

